(This highlights both advanced algorithms, and the dangers of overfitting, and achieves a zen quality with the "error below zero" reference - a data mining equivalent of "what is the sound of one hand clapping").

Honorable mentions include:

Model nearly done
Wait! Data from the future
It predicts too well

Andrew Cathie, New Zealand

no deviations
subjective quality norm
sense of humor good

Ian Painter, USA

I was like her
according to Pearson R
we were both outliers

Atif Abdul-Rahman, Pakistan.

Here is also a Tanka, a longer version (with lines of 5-7-5-7-7 syllables)